The BBC reports that Russian FSB contractor Sytech was breached and lost over 7.5 TB of data and tools related to special projects like:
Nautilus - Collects information about users on social networks such as Facebook, and LinkedIn.
Mentor - This project monitors selected email accounts at specified intervals in order to collect information related to certain phrases.
Nadezhda - Is a project designed to visualize how Russia is connected to the rest of the Internet.
Nautilus-S - de-anonymizes users on the Tor network by creating exit nodes that were controlled by the Russian government. This project was allegedly started at the request of the Russian Research Institute "Kvant".
Reward - is designed to penetrate and perform covert operations on peer-to-peer networks. This includes BitTorrent, Jabber, OpenFT, and ED2K
Tax-3 is the most recent project and was commissioned by "Chief Scientific Innovation Innovation Center JSC, reporting to the Federal Tax Service."
The BBC stated that this is the largest data leak in the history of Russian special services.